Reference GameObjects from an Array

Question

I am creating a small tile game and I thought it would be fun to instantiate the tiles and store a reference to them in an array on start, but I am having a little trouble. I have tried looking this up, but I am really struggling to search for reinvent information.

In the below code I create an array, instantiate a tile, rename it so it matches the grid address I want to use and then I have tried to put it into the array. But the print functions all return 3-3, so it appears that I have added a reference to my Tile GameObject in my script rather than each array address referencing a different tile. I do intend to pass this array to another function once fixed, but how do I fix this?

 public class InstantiateGrid : MonoBehaviour {
 
     public GameObject Tile;
 
     void Start () {
     
     GameObject[,] tileArray = new GameObject[3,3];
     
     for (int i = 1; i < 4; i++) {
         for (int j = 1; j < 4; j++) {
             Object.Instantiate(Tile);
             Tile.name = i + "-" + j;
             tileArray[i,j] = Tile;
         }
     }

     print (tileArray[1,1]);
     print (tileArray[1,2]);
     print (tileArray[1,3]);
     }
 }

Answer 1

Best Answer

Answer by OncaLupe · Dec 06, 2015 at 01:26 AM

'Tile' is a reference to the prefab object, not the newly instantiated copy. All you're doing is renaming the prefab and adding a reference of the prefab to the array. You need a temp variable to store the instantiated reference to. Also, you're not assigning anything to the first slots of the array. All list/array style variables in coding start at 0. The provided code also gives an IndexOutOfRangeException error when trying to assign to slot 3 as the array goes from 0 to 2.

 using UnityEngine;
 using System.Collections;
 
 public class InstantiateGrid : MonoBehaviour
 {
     GameObject[,] tileArray = new GameObject[3,3];
     public GameObject TilePrefab;
     
     void Start () {
         GameObject tileInstance;
 
         for (int i = 1; i < 4; i++) {
             for (int j = 1; j < 4; j++) {
                 tileInstance = Instantiate(TilePrefab) as GameObject;
                 tileInstance.name = i + "-" + j;
                 tileArray[i-1, j-1] = tileInstance;
             }
         }
 
         print (tileArray[0,0]);
         print (tileArray[0,1]);
         print (tileArray[0,2]);
     }
 }

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Decompiled · Dec 06, 2015 at 05:28 PM 0

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Thank you! That is really obvious now.

Reference GameObjects from an Array

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